Which resources are significantly polluted by heavy metals like mercury?
a. soil
b. water
c. neither a nor b
d. both a and b

Which statement best describes how atoms combine to form sodium chloride (nacl)? a. a positively charged sodium ion and a positively charged chlorine ion form an covalent bond. b. a positively charged sodium ion and a negatively charged chlorine ion form an covalent bond. c. a positively charged sodium ion and a positively charged chlorine ion form an ionic bond. d. a positively charged sodium ion and a negatively charged chlorine ion form an ionic bond.

What is the mass of sodium in 3 moles of sodium chloride

1. list three scientific reasons cockroaches may fly.